keep up
apprise
look in on
be on the ball
keep across
know what's what
know the score
know what's going on
be with it
look around
keep someone on ice
watch it
hip
warn
dwell
withhold
keep track
whiddle
let know
have one's wits about one
shoot from the lip
loop in
micropander
keep a weather eye open
remember
double check
triple check
follow
check on
reconcile
check in
know which side one's bread is buttered on
know what is what
know one's ass from a hole in the ground
wise up
sing the same tune
advise
notify
send word
give notice
reconfide
apprize
tell of
hold the line
follow up
talk through
guard one's tongue
keep abreast
make sure
know like the back of one's hand